You forgot about the part where she tried to call her best friend using her bluetooth headset but the two devices became unpaired.

Well, I just now saw a promo for "Knocked Up." It seems that one of the main themes of the movie is people who want to pair up, but just can't make a stable connection. Oh, sure, they may pair up for a little while, maybe even for the night, but then the connection is lost. They are frustrated, dejected and desperate.